
Concept explainers
Which structure or compartment is part of the symplast?
- A. the interior of a vessel element
- B. the interior of a sieve tube
- C. the cell wall of a mesophyll cell
- D. an extracellular air space

Introduction:
The symplast of a plant involve inner plasma membrane that facilitates diffusion of water and its solutes. The plasmodesmata forms the channel for the direct flow sugars, amino acids, and ions and other small molecules between cells. Transport of sugars is also occurs from mesophyll cells to sieve tubes through symplast.
The apoplastic pathway allows the molecules and water to move from epidermis to the cortex to reach endodermis. After reaching to endodermis, solutes are forced to choose symplastic pathway by the casparian strip. Solutes are filtered passively, and they reach to the pericycle and moved to the xylem for the transport to distant parts of the plant.
Answer to Problem 1TYU
Correct answer:
Sieve tube are the living that are tubular in shape and form a web by connecting the plant from end to end from the cortex of the root through the cytoplasm of the cells present in between the cells of root hair and the xylem and form the symplastic pathway. Therefore option (B) is correct.
Explanation of Solution
Reason for correct statement:
Phloem sap moves through the sieve tubes from a sugar source to the sugar sink via symplastic path or apoplastic path (depend on the species).
Option (B) is given as “the interior of a sieve tube”.
“Interiors of a sieve tube helps in maintain the sucrose and organic molecule concentration by active transport using symplastic pathway”, it is the right answer.
Hence, option (B) is correct.
Reasons for incorrect statements:
Option (A) is given as “the interior of a vessel element”.
The apoplastic pathway involves everything external to the plasma membrane that is the cell wall, interior portion of vessel elements and extracellular spaces. So, it is a wrong answer.
Option (C) is given as “the cell wall of the mesophyll cell”.
The cell wall of the mesophyll cell is a part of the apoplastic pathway. So, it is a wrong answer
Option (D) is given as “an extra cellular air space”.
As, the apoplastic pathway involves the extracellular spaces and tracheids. So, it is a wrong answer
Hence, options (A), (C), and (D) are incorrect.
The interior of a sieve tube is a part of symplast and helps in transport of sucrose from sugar source to sugar sink.
Want to see more full solutions like this?
Chapter 29 Solutions
Campbell Biology in Focus (2nd Edition)
Additional Science Textbook Solutions
Biological Science (6th Edition)
Chemistry: The Central Science (14th Edition)
Laboratory Manual For Human Anatomy & Physiology
SEELEY'S ANATOMY+PHYSIOLOGY
Biology: Life on Earth with Physiology (11th Edition)
- Amino Acid Coclow TABle 3' Gly Phe Leu (G) (F) (L) 3- Val (V) Arg (R) Ser (S) Ala (A) Lys (K) CAG G Glu Asp (E) (D) Ser (S) CCCAGUCAGUCAGUCAG 0204 C U A G C Asn (N) G 4 A AGU C GU (5) AC C UGA A G5 C CUGACUGACUGACUGAC Thr (T) Met (M) lle £€ (1) U 4 G Tyr Σε (Y) U Cys (C) C A G Trp (W) 3' U C A Leu בוט His Pro (P) ££ (H) Gin (Q) Arg 흐름 (R) (L) Start Stop 8. Transcription and Translation Practice: (Video 10-1 and 10-2) A. Below is the sense strand of a DNA gene. Using the sense strand, create the antisense DNA strand and label the 5' and 3' ends. B. Use the antisense strand that you create in part A as a template to create the mRNA transcript of the gene and label the 5' and 3' ends. C. Translate the mRNA you produced in part B into the polypeptide sequence making sure to follow all the rules of translation. 5'-AGCATGACTAATAGTTGTTGAGCTGTC-3' (sense strand) 4arrow_forwardWhat is the structure and function of Eukaryotic cells, including their organelles? How are Eukaryotic cells different than Prokaryotic cells, in terms of evolution which form of the cell might have came first? How do Eukaryotic cells become malignant (cancerous)?arrow_forwardWhat are the roles of DNA and proteins inside of the cell? What are the building blocks or molecular components of the DNA and proteins? How are proteins produced within the cell? What connection is there between DNA, proteins, and the cell cycle? What is the relationship between DNA, proteins, and Cancer?arrow_forward
- please fill in the empty sports, thank you!arrow_forwardIn one paragraph show how atoms and they're structure are related to the structure of dna and proteins. Talk about what atoms are. what they're made of, why chemical bonding is important to DNA?arrow_forwardWhat are the structure and properties of atoms and chemical bonds (especially how they relate to DNA and proteins).arrow_forward
- The Sentinel Cell: Nature’s Answer to Cancer?arrow_forwardMolecular Biology Question You are working to characterize a novel protein in mice. Analysis shows that high levels of the primary transcript that codes for this protein are found in tissue from the brain, muscle, liver, and pancreas. However, an antibody that recognizes the C-terminal portion of the protein indicates that the protein is present in brain, muscle, and liver, but not in the pancreas. What is the most likely explanation for this result?arrow_forwardMolecular Biology Explain/discuss how “slow stop” and “quick/fast stop” mutants wereused to identify different protein involved in DNA replication in E. coli.arrow_forward
- Biology (MindTap Course List)BiologyISBN:9781337392938Author:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. BergPublisher:Cengage LearningConcepts of BiologyBiologyISBN:9781938168116Author:Samantha Fowler, Rebecca Roush, James WisePublisher:OpenStax College
- Biology 2eBiologyISBN:9781947172517Author:Matthew Douglas, Jung Choi, Mary Ann ClarkPublisher:OpenStax



